大气飘尘冲击式分级采样器

本文分析了冲击式分级采样器的工作原理,对采样器中各种几率给予了严格的定义,阐明了这些几率概念之间的差别和相互联系,提出了多级采样器的研究简化为单级采样器研究的方法.提供了考虑粘性效应及用二种阻力公式(斯托克斯公式和标准阻力公式)的数值计算的P(Θ,Ω~

Programas de investimento do governo federal : guia informal

Apresenta a distribuição dos programas de investimento do Governo Federal, organizada por ministério e por secretaria, de acordo com informações colhidas em sites institucionais e normas técnicas fornecidas pelos mesmos. Oferece informações sobre os procedimentos adequados para a obtenção desses recursos e indica os caminhos para parlamentares, prefeitos e outros agentes políticos encaminharem seus pleitos. Traz informações detalhadas dos programas do Governo Federal, tanto para facilitar o acesso aos seus recursos, como também para gerar melhores condições de fiscalização.

Aprimoramentos da Lei Geral das Micro e Pequenas Empresas

Seminário realizado pela Comissão de Finanças e Tributação da Câmara dos Deputados, com a participação da Comissão de Assuntos Econômicos do Senado Federal e apoio da Frente Parlamentar Mista das Micro e Pequenas Empresas, com o objetivo de "sintetizar as propostas acumuladas pela sociedade, com relação aos projetos que tramitam na Câmara dos Deputados e no Senado Federal acerca das possíveis alterações na Lei Complementar no 123/2006".

由衰减常数确定振动弛豫速率

<正> 分子的振动弛豫过程,在高速气体动力学、化学动力学及超声的许多过程中,特别是在分子激光器中,起着重要的作用。已积累了丰富的弛豫实验数据。但是,弛豫实验中只能测得某宏观物理量的变化,如在激波管或激光荧光实验中,观察特定波长的光辐射随时间的变化,可监视相应振型的弛豫过程。这种变化除开始的短暂时期外,呈Ⅰ—

φ800激波管流场参数测量

<正> 1.实验装置和测量原理 本实验使用不锈钢圆形直激波管,高压段长1.6m,内径223mm;低压及实验段内径800mm。使用氢氧燃烧驱动,驱动压力约80ata,测量支架距膜片的有效距离为14m。 我们用薄膜电阻温度计式的金膜热探头在激波管中测量②区长度和波面形状,用电探针来测量分界区与③区的交界处。它们的信号直接或经过热电模拟线路以后,输

Is there chaotic synchronization in space extend systems

Based on coupled map lattice (CML), the chaotic synchronous pattern in space extend systems is discussed. Making use of the criterion for the existence and the conditions of stability, we find an important difference between chaotic and nonchaotic movements in synchronization. A few numerical results are presented.

Experimental investigation on low-temperature fatigue crack propagation in offshore structural steel A131 under random sea ice loading

An apparatus of low-temperature controlling for fatigue experiments and its crack measuring system were developed and used for offshore structural steel A131 under conditions of both low temperature and random sea ice. The experimental procedures and data processing were described, and a universal random data processing software for FCP under spectrum loading was written. Many specific features of random ice-induced FCP which differed with constant amplitude FCP behaviours were proposed and temperature effect on ice-induced FCP was pointed out with an easily neglected aspect in designing for platforms in sea ice emphasized. In the end, differences of FCP behaviours between sea ice and ocean wave were presented.

Elastodynamic stress-intensity factors for a semiinfinite crack under 3-d combined mode loading

The dynamic stress intensity factor histories for a half plane crack in an otherwise unbounded elastic body are analyzed. The crack is subjected to a traction distribution consisting of two pairs of suddenly-applied shear point loads, at a distance L away from the crack tip. The exact expression for the combined mode stress intensity factors as the function of time and position along the crack edge is obtained. The method of solution is based on the direct application of integral transforms together with the Wiener-Hopf technique and the Cagniard-de Hoop method, which were previously believed to be inappropriate. Some features of solutions are discussed and the results are displayed in several figures.

Complex stress functions and plastic zone sizes for notch cracks subjected to various loading conditions

In this paper, the conformal mapping method is used to solve the plane problem of an infinite plate containing a central lip-shaped notch subjected to biaxial loading at a remote boundary or a surface uniform pressure on the notch. The stress intensity factors KI and KII are obtained by the derived complex stress functions. The simple analytical expressions can be applied to the situation of cracks originating from a circular or an elliptical notch. The plastic zone sizes for such notch cracks are subsequently evaluated in light of the Dugdale strip yield concept. The results are consistent with available numerical data.

Presidentes da Câmara dos Deputados : 14 º - Antônio Carlos Ribeiro de Andrada

Resumo da vida pública de Antônio Carlos Ribeiro de Andrada. Inclui referências bibliográficas de trabalhos escritos por Antônio Carlos Ribeiro de Andrada e de trabalhos sobre ele.

半焦在流化床燃烧中Cl元素影响CO氧化的试验

在非均匀布风的流化床燃烧系统中进行了半焦中添加PVC/NaCl的混烧试验,研究了Cl元素对燃烧中CO氧化的影响以及混烧时SO_x等污染物的生成规律.试验结果表明,半焦与PVC/NaCl混烧在技术上可行,添加Cl元素抑制CO氧化,加入PVC增加SO_2排放,而加入NaCl则减少SO_2排放.